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Chemically disordered Ni3Al synthesized by high vacuum evaporation

Published online by Cambridge University Press:  31 January 2011

S.R. Harris ,
D.H. Pearson ,
C.M. Garland  and
B. Fultz
S.R. Harris
Affiliation:
Division of Engineering and Applied Science, 138–78, California Institute of Technology, Pasadena, California 91125
D.H. Pearson
Affiliation:
Division of Engineering and Applied Science, 138–78, California Institute of Technology, Pasadena, California 91125
C.M. Garland
Affiliation:
Division of Engineering and Applied Science, 138–78, California Institute of Technology, Pasadena, California 91125
B. Fultz
Affiliation:
Division of Engineering and Applied Science, 138–78, California Institute of Technology, Pasadena, California 91125
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Abstract

Films of chemically disordered fcc Ni3Al were synthesized by the vacuum evaporation of Ni3Al onto room temperature and liquid nitrogen temperature substrates. X-ray diffractometry and transmission electron microscopy showed the material to be single phase with an average grain size of about 4 nm. The formation of the equilibrium L12 ordered phase occurred simultaneously with grain growth at temperatures above 350°C. Differential scanning calorimetry provided ordering enthalpies of 7 kJ/mole and 9 kJ/mole for material evaporated onto room temperature and liquid nitrogen temperature substrates, respectively.

Type
Materials Communications
Information
Journal of Materials Research , Volume 6 , Issue 10 , October 1991 , pp. 2019 - 2021
Copyright
Copyright © Materials Research Society 1991

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